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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family4 *5 * Copyright (c) 2014-2015 Takashi Sakamoto6 */7 8#include <sound/asound.h>9#include "digi00x.h"10 11static void handle_unknown_message(struct snd_dg00x *dg00x,12 unsigned long long offset, __be32 *buf)13{14 unsigned long flags;15 16 spin_lock_irqsave(&dg00x->lock, flags);17 dg00x->msg = be32_to_cpu(*buf);18 spin_unlock_irqrestore(&dg00x->lock, flags);19 20 wake_up(&dg00x->hwdep_wait);21}22 23static void handle_message(struct fw_card *card, struct fw_request *request,24 int tcode, int destination, int source,25 int generation, unsigned long long offset,26 void *data, size_t length, void *callback_data)27{28 struct snd_dg00x *dg00x = callback_data;29 __be32 *buf = (__be32 *)data;30 31 fw_send_response(card, request, RCODE_COMPLETE);32 33 if (offset == dg00x->async_handler.offset)34 handle_unknown_message(dg00x, offset, buf);35}36 37int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)38{39 struct fw_device *device = fw_parent_device(dg00x->unit);40 __be32 data[2];41 42 /* Unknown. 4bytes. */43 data[0] = cpu_to_be32((device->card->node_id << 16) |44 (dg00x->async_handler.offset >> 32));45 data[1] = cpu_to_be32(dg00x->async_handler.offset);46 return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,47 DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,48 &data, sizeof(data), 0);49}50 51void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)52{53 if (dg00x->async_handler.callback_data == NULL)54 return;55 56 fw_core_remove_address_handler(&dg00x->async_handler);57 58 dg00x->async_handler.callback_data = NULL;59}60 61int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)62{63 static const struct fw_address_region resp_register_region = {64 .start = 0xffffe0000000ull,65 .end = 0xffffe000ffffull,66 };67 int err;68 69 dg00x->async_handler.length = 4;70 dg00x->async_handler.address_callback = handle_message;71 dg00x->async_handler.callback_data = dg00x;72 73 err = fw_core_add_address_handler(&dg00x->async_handler,74 &resp_register_region);75 if (err < 0)76 return err;77 78 err = snd_dg00x_transaction_reregister(dg00x);79 if (err < 0)80 snd_dg00x_transaction_unregister(dg00x);81 82 return err;83}84